Structureless files - There is no internal structure imposed on the contents of a file. Any structure desired by the user can be used.

The world's biggest cookie was likely baked in a large industrial oven with special equipment to handle its size. The dough would have been carefully prepared, rolled out, and baked in sections before being assembled into the final giant cookie.

• sheer
• silver
• simmer
• singer
• sister
• slipper
• smear
• smother
• sneer
• sour
• soccer
• spar
• spider
• spinner
• splinter
• sponsor
• spur
• star
• steer
• stellar
• stir
• strainer
• stranger
• stutter
• summer
• super
• swagger
• sweater
• swimmer
• swinger

Unfortunately, the question is a little bit too general for a good answer. Different types of poetry have different structures, and some poetry (free verse) is essentially structureless. The only general things that you could say is that poetry is (usually) shorter than stories and novels, and poetry is (usually) a more concise way of writing... poets tend to struggle over finding the perfect _word_ to describe something, whereas non-poets could write three sentences or more to express the same thing. That's all I can think of that is (usually) true of poetry in general. Some poems rhyme, many do not. Some poems have limitations on words or syllables in each line. Some do not.